A hotfix is available that improves the performance of CLR when a .NET Framework 3.5 SP1-based application runs in a virtualized environment

Article ID: 981619 - View products that this article applies to.
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Introduction

A hotfix is available that improves the performance of common language runtime (CLR) when a .NET Framework 3.5 Service Pack 1 (SP1)-based application runs in a virtualized environment. This hotfix reduces high CPU utilization of the hypervisor in a virtualized environment. For example, the hypervisor overhead is reduced by about 5% in Windows Azure after you apply this hotfix.

RESOLUTION

Hotfix information

A supported hotfix is now available from Microsoft. However, it is intended to correct only the problem that is described in this article. Apply it only to systems that are experiencing this specific problem. This hotfix may receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next software update that contains this hotfix.

To resolve this problem immediately, contact Microsoft Customer Support Services to obtain the hotfix. For a complete list of Microsoft Customer Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:
http://support.microsoft.com/contactus/?ws=support
Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

You must have the .NET Framework 2.0 Service Pack 2 (SP2) or the .NET Framework 3.5 SP1 installed to apply this hotfix.

Restart requirement

You do not have to restart the computer after you apply the hotfix if the affected files are not being used.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

File information

The English version of this hotfix has the file attributes (or later file attributes) that are listed in the following table. The dates and times for these files are listed in Coordinated Universal Time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time item in Control Panel.
For all supported x86-based versions of Windows Server 2003 and of Windows XP
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File nameFile versionFile sizeDateTimePlatform
Mscordacwks.dll2.0.50727.4448989,01609-Apr-201005:13x86
Mscorlib.dll2.0.50727.44484,550,65609-Apr-201005:13x86
Mscorwks.dll2.0.50727.44485,819,72809-Apr-201005:13x86
Sos.dll2.0.50727.4448388,93609-Apr-201005:13x86
For all supported x64-based versions of Windows Server 2003 and of Windows XP
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File nameFile versionFile sizeDateTimePlatform
Mscordacwks.dll2.0.50727.44481,758,55208-Apr-201023:35x64
Mscorlib.dll2.0.50727.44484,567,04008-Apr-201023:29x64
Mscorwks.dll2.0.50727.444810,053,96808-Apr-201023:33x64
Sos.dll2.0.50727.4448485,19208-Apr-201023:30x64
For all supported IA-64-based versions of Windows Server 2003 and of Windows XP
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File nameFile versionFile sizeDateTimePlatform
Mscordacwks.dll2.0.50727.44483,085,14409-Apr-201000:04IA-64
Mscorlib.dll2.0.50727.44484,009,98409-Apr-201000:02IA-64
Mscorwks.dll2.0.50727.444820,176,20808-Apr-201023:59IA-64
Sos.dll2.0.50727.4448872,77609-Apr-201000:01IA-64
For all supported x86-based versions of Windows 7
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File nameFile versionFile sizeDateTime
Mscorlib.dll2.0.50727.50094,550,65614-Apr-201022:52
Mscordacwks.dll2.0.50727.5009995,67231-Mar-201022:56
Mscorwks.dll2.0.50727.50095,822,80031-Mar-201022:56
Sos.dll2.0.50727.5009388,93614-Apr-201022:52
For all supported x64-based versions of Windows 7 and of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Mscorlib.dll2.0.50727.50094,567,04014-Apr-201022:51
Mscordacwks.dll2.0.50727.50091,757,52831-Mar-201022:54
Mscorwks.dll2.0.50727.500910,044,75231-Mar-201022:54
Sos.dll2.0.50727.5009485,19214-Apr-201022:51
For all supported IA-64-based versions of Windows Server 2008 R2
Collapse this tableExpand this table
File nameFile versionFile sizeDateTime
Mscorlib.dll2.0.50727.50094,009,98414-Apr-201022:51
Mscordacwks.dll2.0.50727.50093,086,16831-Mar-201022:56
Mscorwks.dll2.0.50727.500920,187,47231-Mar-201022:56
Sos.dll2.0.50727.5009872,77614-Apr-201022:51

STATUS

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

MORE INFORMATION

For more information about software update terminology, click the following article number to view the article in the Microsoft Knowledge Base:
824684 Description of the standard terminology that is used to describe Microsoft software updates

Properties

Article ID: 981619 - Last Review: May 25, 2010 - Revision: 1.1
APPLIES TO
  • Microsoft .NET Framework 3.5 Service Pack 1
  • Microsoft .NET Framework 2.0 Service Pack 2
Keywords: 
kbexpertiseadvanced kbsurveynew kbqfe kbhotfixserver KB981619

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